2. Why is the work done said to be zero
when the force acts at a right angle to the
direction of displacement?
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Explanation:
If there is no motion in the direction of the force, then no work is done by that force. ... There are many important examples of forces which do no work because they act perpendicular to the motion. For circular motion, the centripetal force always acts at right angles to the motion.
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work is the dot product of force and displacement
w = f × d cos ¢
at 90°
cos¢ = 0
therefore work is also ZERO
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